Get started with the Flask framework by building six interesting applications
About This Video
In Detail
Many developers, and even beginners, opt for the Flask framework to build web applications because of its easy-to-understand and …
Get started with the Flask framework by building six interesting applications
About This Video
In Detail
Many developers, and even beginners, opt for the Flask framework to build web applications because of its easy-to-understand and well-defined framework. This course will show you how to use the Flask framework's power and its extensions to build powerful and robust web applications.
The course starts by taking you through the process of setting up the Flask environment on your machines. Next, you will understand the Flask basics and templates and learn how to create and connect to a database. In the rest of the course, you will build six interesting Python web applications to dive deep into the concepts of the Flask framework.
By building these applications, you will learn how to create and connect the applications to databases, how to use Flask to process incoming request data, how to build an API with Flask, how to handle user sessions, and how to deploy applications to a server. In addition to this, you will also cover popular Flask extensions, such as Flask-SQLAlchemy, Flask-Bootstrap, Flask-Babel, and learn how these extensions add powerful functionalities to your applications.
By the end of this course, you will be well-versed in the Flask framework and extensions and will have gained the skills to build real-world applications.
Who this book is for
If you are a beginner or an experienced Python developer, who is looking to learn Flask to develop Python web-based applications, this course is for you. Basic knowledge of Python is needed to get started with this course, and prior knowledge of HTML would be an added advantage.
Chapter 1 : Flask Basics
Installation on Windows
Two Ways of Running Flask Applications
Installing and Running Hello World
Introduction to Routes
Route Methods
Route Variables
Requesting Query String
Requesting Form Data
Requesting JSON Data
Incoming Request Method
Redirects and url_for
Configuration
Sessions
Debug Mode
Chapter 2 : Templates
Introduction to Templates
Template Variables
Conditionals
Loops
Static Files
Inheritance
Include
Chapter 3 : Database
Creating the Database
Connect to the Database
Queries
Inserting Data
View All Results
Chapter 4 : Food Tracker Application
Demo
Initial HTML Files
Adding Templates
Creating the Database
Adding Database Helpers
Working with the Food Form
Inserting Food Data into the Database
Displaying All Foods in the Database
Inserting the Date
Querying All Dates
Day Screen
Adding Food to the Database
Getting a List of Foods for the Day
Getting Food Totals for the Day
Links
Calculating Totals Per Day
Adding Links
Refactoring
Setting Up Deployment Server on Amazon Lightsail
Deploying to Amazon Lightsail Server
Errata
Chapter 5 : Question and Answer Application
Demo
Overview of Templates
Install and Templates
Database Helpers
Creating the Database
Registering a User
Logging In
Sessions
Common User Functions
Updating Links
Creating Test Users
User Setup Page
Creating a Question
Listing Questions
Answering Question
Home Route Questions
Question Page
Preventing Duplicate Users
Protecting Routes
Protecting Routes by Role
Login Failure Messages
Formatting Queries
Added Link Macro
Base Template
Deploying to Heroku
Converting to Postgres
Static Secret Key on Heroku
Chapter 6 : Member API
Demo
Setting Up the Application and Test with Postman
Adding Database Helpers
Creating the Database
Creating a New Member
Returning a Member after Creation
Getting All Members
Getting One Member
Editing a Member
Deleting a Member
Authentication
Authentication Decorator
Deploying to Python Anywhere
Chapter 7 : Flask-SQLAlchemy
Setting Up a Database and Determining the URI
Installing Flask-SQLAlchemy
Connecting to the Database
Creating a Table
Inserting Data
Updating Data
Deleting Data
Introduction to Queries
Generative Queries
Not Equals and Like
In and Not In
Null and Not Null
And
Or
Order By
Limit
Offset
Count
Inequality
One-to-Many Relationship
One-to-Many Queries
Many-to-Many Relationships
Many-to-Many Queries
Chapter 8 : Flask-WTF
Installing and Setting Up Flask-WTF
Creating a Form
Submitting the Form
Validators
More Fields
Adding an Extra Validator
Changing Labels and Defaults
Prepopulating Data
Populating Obj
More on CSRF
Jinja Macro
Form Inheritance
Field Enclosures
Field List
Deleting Field
Dynamic Forms
Note on JavaScript AJAX
Recaptcha Field
Inline Validators
Information on Other Fields and Validators
Date Fields
Flask-WTF Example
Flask-WTF with Flask-Bootstrap
Chapter 9 : Flask-Bootstrap
Installing and Setting Up Flask-Bootstrap
Blank HTML
Available Blocks
Chapter 10 : Flask-Mail
Configuring Flask-Mail
Setting Up Server and Sending an Email
Notes on Debug
Email Body
Adding More Recipients
Adding Sender Name
Bulk Messages
Attachments
Other Message Parameters
Setting Up Gmail
Chapter 11 : Flask-Migrates
Installing Flask-Migrates and Setting Up an Environment Variable
Creating Database, Adding SQLAlchemy, and Migrating
Creating Table Upgrade in SQLite
Upgrading with SQLite
SQLite Downgrades
Upgrading and Downgrading
MySQL Upgrade and Downgrade
Manually Editing Migration
Dropping Columns in SQLite
Chapter 12 : Flask-Uploads
Installing and Configuring Flask-Uploads
Uploading a Form
Uploading the Image
Allow and Deny
Default Dest
Combining Extensions
Chapter 13 : Flask-Login
Installing and Initializing Flask-Login
Adding User Model
User Loader
Login User
Current User
Log Out a User
Creating a Login Form
Redirecting to the Login Route
Login Message
Redirecting Messages
Remember Me
Fresh Login
Alternative Tokens
Auto Expire
Using MongoDB
Chapter 14 : Flask-Admin
Installing and Setting Up Flask-Admin
Adding User View
Viewing Table with Multiple Columns
Tables with Relationships
Removing a Column from the View
Displaying Primary Key Column
Enabling/Disabling, Creating, Editing, and Deleting
Exporting Table Data
Creating a Modal
Other Attributes
Using on_model_change to Automatically Hash a Password
File Admin
Modifying the Home Template
Modifying Other Views
Creating a New View
URL For
Inline Models
Authentication for Views
Adding Flask-Login
Chapter 15 : Flask-User
Installing and Configuring Flask-User
Creating a Database
Flask-User Sign In and Register Screens
Creating a Protected Page
What Flask-User Does to the Database Record?
Enabling Emails
Modifying Templates
Modifying Email Templates
Changing the After-Register Endpoint
Current User Information
Chapter 16 : Flask-Babel
Installing Flask-Babel
Locale
Dates and Datetime
Marking Words for Translation
Translations
Poedit
Chapter 17 : Flask-Restless
Installing Flask-Restless
Setting Up Models
Creating a Database
Integrating Flask-Restless
GET Requests
GET Specific Items
POST Requests
DELETE Requests
PUT Requests
Limit
Offset
Order By
Searching Queries
In and Not In Operators
Is Null and Is Not Null Operators
Like Operator
Or Queries
Any Operator
Has Operator
Deleting with Queries
Patching with the Queries Bug
Pagination
Chapter 18 : Flask-SocketIO
Installing and Setting Up Flask-SocketIO
Setting Up JavaScript Client
Sending Messages from Client to Server
Sending Messages from Server to Client
Emitting Custom Events
Sending and Receiving JSON
Multiple Clients
Broadcasting Messages
Server Initiated Events
Namespaces
Session IDs
Sending Private Message
Joining a Room
Leaving a Room
Closing a Room
Connecting and Disconnecting
Chapter 19 : Flask-Security
Installing and Setting Up Flask-Security
Creating a Database
Viewing Login and Register Routes
Additional Routes
Login Required and Current User
Roles
Enabling Mail
Custom Emails
Custom Views
Extending the Forms
HTTP Basic Authentication
Chapter 20 : Engage! A Twitter Clone
Overview of Templates
Creating Routes with Templates
Converting Static Resources
Preparing Flask-Migrate and Flask-SQLAlchemy
Creating an SQLite Database
Adding User Model and Creating a Table
Creating the Register Form
Converting the Register Form to WTForm
Testing the Register Form
Adding Error Messages to the Register Form
Handling the Profile Image Upload
Saving the Registration Data to the Database
Creating the Login Form
Creating the Login Route
Finishing the Login Form
Displaying the Profile Information
Creating Tweet Model and Migrating
Creating a Tweet Form
Updating the Timeline to Be Dynamic
Adding Time Since the Creation of a Tweet
First Refactor
Timeline Image and Total Tweets
General Timeline Page
Making a Profile General
Follower Model
Adding a Follow Route
Updating the Follower Count and List of Followers
Creating a Follow Link
Testing the Follow Link
Updating the Timeline Page
Adding Links to User Profiles
Who to Watch Section?
Adding User Timeline Links
Refactoring HTML
Refactoring Navigation
Making Navigation Links Dependent on Login Status
Updating the Timeline Follower Count and Changing the Homepage
Refactoring Views
Refactor Register Template
Conclusion
Chapter 21 : Store Application
Initial Files
Adding the Product Table
Creating the Add Product Form
Adding Products to the Database
Admin Dashboard Product List
Showing the Dollar Amount and Product Counts
Adding Products to the Homepage
The Product Page
Adding Products to the Cart
The Cart Session
Displaying Items in the Cart
Removing Items from Cart
Creating the Order Tables
Creating the Checkout Form – Part 1
Checkout Form - Part 2
Checkout Form - Part 3
Randomizing the Reference
Checkout Screen Cart Details
Managing Pending Orders
Calculating the Order Total
Order Screen
Updating the Stock Totals
Chapter 22 : Forum Application
Overview of the Forum Application
Setting Up the Flask-Security Models
Setting Up the Register Page
Setting Up a User
Login Screen
Thread Model
Saving the Thread Form to the Database
Displaying Threads from the Database
Updating the Thread Model to Include the Date
Thread Page
Creating the Reply Model
Handling Replies
Adding the Last Post’s Date
The Profile Page
Adding Links and Wrap Up
Chapter 23 : Weather Application
Introduction
Setting Up the Application
Retrieve API Data
Creating a Database
Adding Cities to the Database
Show Saved City Data
Allow User Save Cities
Install Python-Dotenv
Preventing Duplicate Cities
Preventing Invalid Cities
Message Flashing
Deleting Cities